Determining if Thread is sleeping [duplicate]

Question

I was wondering how I could know if a thread is sleeping or not. I searched around and I gathered some information, form those information I wrote a method isSleeping():boolean that I think I can put in a class to determine if the thread is sleeping or not. I just want to know what I might have missed. Note: I am not experienced 0 days of experience.

//isSleeping returns true if this thread is sleeping and false otherwise.
public boolean isSleeping(){
    boolean state = false;
    StackTraceElement[] threadsStackTrace = this.getStackTrace();

    if(threadsStackTrace.length==0){
        state = false;
    }
    if(threadsStackTrace[0].getClassName().equals("java.lang.Thread")&&
            threadsStackTrace[0].getMethodName().equals("Sleep")){
        state = true;
    }
    return state;
}

Answer 1

Change "Sleep" -> "sleep". Besides you should not take stacktrace on this, your method should accept a Thread parameter. Consider this

    Thread t = new Thread(new Runnable(){
        public void run() {
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    });
    t.start();
    Thread.sleep(100);
    if(t.getStackTrace()[0].getClassName().equals("java.lang.Thread")&&
            t.getStackTrace()[0].getMethodName().equals("sleep")){
        System.out.println("sleeping");
    }

output

sleeping